Protein Data Bank exchange dictionary (pdbx) version 1.0521

_pdbx_reflns_twin.operator

Name:
'_pdbx_reflns_twin.operator'

Definition:

   

The possible merohedral or hemihedral twinning operators for different 
point groups are:

True point group  	Twin operation  	hkl related to
3                      	2 along a,b             h,-h-k,-l  
                  	2 along a*,b*           h+k,-k ,-l 
                   2 along c               -h,-k , l  
4                       2 along a,b,a*,b*       h,-k ,-l   
6                       2 along a,b,a*,b*       h,-h-k,-l  
321                     2 along a*,b*,c         -h,-k , l  
312                     2 along a,b,c           -h,-k , l  
23                      4 along a,b,c            k,-h , l  

References:
 Yeates, T.O. (1997) Methods in Enzymology 276, 344-358. Detecting and
     Overcoming Crystal Twinning.

 and information from the following on-line sites:
   CNS site http://cns.csb.yale.edu/v1.1/
   CCP4 site http://www.ccp4.ac.uk/dist/html/detwin.html
   SHELX site http://shelx.uni-ac.gwdg.de/~rherbst/twin.html

Type: line

Mandatory item: yes

The data value must be one of the following:

h,-h-k,-l

'h+k,-k ,-l'

'-h,-k , l'

'h,-k ,-l'

h,-h-k,-l

'-h,-k , l'

'k,-h , l'

Category: pdbx_reflns_twin

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Crystallographic Information Framework

Protein Data Bank exchange dictionary (pdbx) version 1.0521

_pdbx_reflns_twin.operator

International Tables for Crystallography

Volume G: Definition and exchange of crystallographic data

Edited by S. R. Hall and B. McMahon

IUCrData